{"paper":{"title":"Systematic calculation of s-wave pion and kaon self-energies in asymmetric nuclear matter","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"N. Kaiser, W. Weise","submitted_at":"2001-02-28T16:48:03Z","abstract_excerpt":"We calculate the pion self-energies in asymmetric nuclear matter in the two-loop approximation of chiral perturbation theory. We find three types of corrections beyond the well-known linear density approximation. The resulting s-wave potential (or equivalent mass-shift) of a $\\pi^-$ in the center of a heavy nucleus like Pb turns out to be $U_{\\pi^-}=\\Delta m_{\\pi^-} \\simeq 14$ MeV, about half of what is needed to form the deeply bound and narrow pionic atom-states recently observed at GSI. The potential for a $\\pi^+$ under the same conditions is $U_{\\pi^+}=\\Delta m_{\\pi^+} \\simeq -1$ MeV. In t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/0102062","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/nucl-th/0102062/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}